Obstetrical forceps



Aug. 12, 1958 w. B. sHUTE oBsTETRrcAL FoRcEPs Filed sept. 1s, 1957 This invention relates to obstetrical forcepsl and in particular to obstetrical forceps havingI a novel linkage prior U. S. Patent No. 2,757,673, issued to me on August 7th, 1956.

at the end remote from said handle, a bore within a rirst of said handles, a screw-threaded member adapted to move longitudinally within said bore, saidl threaded in said first handle and co-operating `with said inner end of said threaded member to prevent relative rotation of said rst handle and said threaded member.

fi'lfi Patented Aug. l2, 1958 with a pistol grip 9 having an axial bore it) formed therein and a second recess 1l extending across said bore at right angles thereto- The handle portion 3 of the main member l is provided with a curved linger grip l2 projecting therefrom at substantially right angles thereto whilst the wall of the handle portion 3 is also provided `with a curved strap thumb-wheel 17 housed within the recess 11 in the main member 2 and having its peripheral portion substantially projecting therefrom (see Figure 2). As will be seen more clearly in Figure l, the pistol grip 9 is provided with a lug 18 adapted to engage with a keyway 19 stud, when in its normal position, being adapted to maintain the head 15 of the screw 16 between the strap 13 and the end wall 14 of the recess 7.

From the above description it will ybe appreciated that due to the respective engagements of the handle portions 17 will cause the screw 16 to advance or retreat thus bringing about parallel movement of the blades easily and swiftly.

On the other hand, when it is desired to sterilize or clean the instrument, the components thereof can `be dismantled with utmost ease by moving the stud 23 within its slot 22 thereby permitting the main member i to be disengaged from the head 15 of the screw 16. Thus the two main members will be completely free of one another.

Thereafter, by rotation of the screw i6, the latter c n be disengaged from the pistol grip 9 and the thumbber.

Wheel 17 and when this occurs, said thumb-wheel l.7 can also be removed from its associated recess 11. Thus for cleaning purposes the assembly can be broken down into four main components.

it will also be appreciated that due to the engagement oi the lug l with the lieyway i9 of the screw, no rocking movement of the components can occur, and thus no undue pressure can be exerted on the tip of the blades thereby obviating any crushing eliect which would be liable to occure if the blades did not automatically move parallel to one another; thus, the parallel movement of the two main members towards and away from one another is achieved in a smooth and harmonious manner.

It is within the ainbit et the invention to omit the lip 2t) from the elongated head l5 and, in consequence, its associated slot 2l, too, would be omitted. Thus, the elongated head l5 will be a relatively snug fit within its associated recess. ln this case, it has been found by experience that the stud 23 operates perfectly satisfactorily to maintain the head in position.

l claim'.

l. A pair oi obstetrical forceps comprising two `main members adapted to move in parallel relation to one another, each of said members having a handle at one end thereof and a blade at the end remote from said handle, a bore within a rst of said handles, a screw-threaded memn bei' adapted to move longitudinally within said bore, said threaded member having an inner end and an outer end, a recess in said tirst handle arranged at right angles to the longitudinal axis of said bore and communicating therewith, a wheel located Within said recess, a threaded axial bore in said wheel for engagement with said threaded member, means located in a second o said handles cooperating with said outer end of said threaded member for bringing about detachable engagement ot said second handle with said threaded member, and means located in said first handle and co-operating with said inner end of said threaded member to prevent relative rotation ot said lirst handle and said threaded mem- 2. A pair of obstetrical forceps comprising two main members adapted to move in parallel relation to one another, each ot said members having handle at one end thereot and a blade at the end remote from said handle,

a bore within a hrst of said handles, a screw-threaded member adapted to move longitudinally within said bore, said threaded member having an inner end and an outer end. a recess in said rst handle arranged at right angles to the longitudinal axis of said bore and communicating therewith, a wheel located within said recess, a threaded axial bore in said wheel for engagement with said threaded member, a recess located in a secon-Cl of said handles adapted to receive said outer end of said threaded rnember, a slot in said second handle, a movable stud in said slot maintaining said outer end of said threaded member 5i in said last mentioned recess, and means located in said first handle and co-operating with said inner end of said threaded member to prevent relative rotation of said first handle and said threaded member.

3. A pair of obstetrical forceps comprising two main Gi) members adapted to move in parallel relation to One another, each of said members having a. handle at one end thereof and a blade at the end remote from said handle, a bore within a first of said handles, a screwthreaded member adapted to move longitudinally within said bore, said threaded member having an inner end and an outer end, a head on said outer end of said threaded member, a recess in said first handle arranged at right angles to tbe longitudinal axis of said bore and coniinunicating therewith, a wheel located within said recess, a threaded axial bore in said wheel for engagement with said threaded member, a recess located in a second of said handles adaptedvto receive said head, a slot in said second handle, a movable stud in said slot maintaining said outer end of said threaded member in said last mentioned recess, and means located in said iirst handle and ico-operating with said inner end of said threaded member to prevent relative rotation of said iirst handle and said threaded member.

4. A pair of obstetrical forceps comprising two main members adapted to move in parallel relation to one another, each of said members having a handle at one end thereof and a blade at the end remote from said handle, a bore within a iirst of said handles, a screw-threaded member adapted to move longitudinally Within said bore, said threaded member having an inner end and an outer end, a head on said outer end of said threaded member, a keyway in said threaded member, a recess in said first handle arranged at right angles to the longitudinal axis ot said bore and communicating therewit a wheel located within said recess, a threaded axial bore in said wheel for engagement with said threaded member, a recess located in a second of said handles adapted to receive said head, a slot in said second handle a movable stud in said slot maintaining said outer end of said threaded member in said last mentioned recess, and means located in said first handle and co-operating with said keyway to prevent relative rotation of said irst handle and said threaded member.

5. A pair of obstetrical forceps comprising two main members adapted to move in parallel relation to one another, each of said members having a handle at one end thereof and a blade at the end remote from said handle, a

bore within a first of said handles, a screw-threaded merriber adapted to move longitudinally within said bore, said threaded 'member having an inner end and an outer end, a head on said outer end of said threaded member, a lip projecting from said head, a keyway in said threaded member, a recess in said first handle arranged at right angles to the longitudinal axis of said bore and communicating therewith, a Wheel located within said recess, a threaded axial bore in said wheel for engagement with said threaded member, a recess located in a second of said handles adapted to receive said head, a slot in said recess located in said second handle to receive said lip, a slot in said second handle, a movable stud in said last mentioned slot maintaining said outer end of said threaded member in said last mentioned recess, and means located in said rst handle and co-operating with said keyway to prevent relative rotation of said rst handle and said threaded member.

6. A pair of obstetrical forceps comprising two main members adapted to move in parallel relation to one another, each of said members having a handle at one end thereof and a blade at the end remote from said handle, a bore within a first of said handles, a screw-threaded member adapted to move longitudinally within said bore, said threaded member having an inner end and an outer end, a head on said outer end of said threaded member, `a lip proiecting from said head, a keyway in said threaded member, a recess in said first handle arranged at right angles to the longitudinal axis of said bore and communicating therewith, a wheel located within said recess, a threaded axial bore in said wheel for engage-` ment with said threaded member, a recess located in a second of said handles adapted to receive said head, a slot in said recess located in said second handle to receive said lip, a slot in said second handle, a movable stud in and sa'd threaded member.

References Cited in the tile of. this patent UNTTED STATES PATENTS 2.757.673 Shute Aug. 7, 1956 

